Seamless steel hardness inspection tool

6.0mm or more in diameter seamless steel pipe, 13mm wall thickness seamless steel pipe material following annealing can be used W-B75-based Webster hardness tester, it tests very fast, easy, seamless steel tubes suitable for rapid non-destructive materials to do qualified test. Seamless steel pipe inner diameter greater than 30mm, wall thickness greater than 1.2mm seamless steel tubes, the use of Rockwell hardness test HRB, HRC hardness. Seamless steel pipe inner diameter greater than 30mm, the seamless steel pipe wall thickness less than 1.2mm, a surface Rockwell hardness tester, hardness testing HRT or HRN. Diameter less than 0mm, more than 4.8mm of seamless steel pipe, using pipe-specific Rockwell hardness test HR15T hardness. When the seamless steel pipe diameter greater than 26mm, you can also use the Rockwell or Rockwell hardness test the surface of pipe wall hardness.

The fire prevention function of Fertilizer special pipe

For the practical application of fertilizer tube to overcome the lack of fire prevention, fire protection must be handled, its purpose is to improve the fire resistance of steel structures to the design specification limits. Here are several different steel structure fire protection measures.

Some of the common sense about seamless steel tube

Seamless steel tube is a kind of round, square and rectangular steel which has hollow section with no surrounding juncture. Seamless steel tube is manufactured with steel ingot or solid tube by perfor

Measures of preventing welded pipe cold crack

Pipe welded joints rigid, multi-layered welding, welding metal bulky, so that welded joints in high-stress state, such as the weld metal has a higher yield point, plastic deformation is difficult to relax through the welded joints of high Stress is easy to weld cracks in the heat affected zone of white areas or areas produce martensite, the formation of HAZ cold cracking. Prevent cold cracking high-pressure pipe is the most effective way to butt up to 550 ~ 700 ℃ pieces of the overall warm-up, followed by the use of heterogeneous weld welding materials. Brittle fracture is caused by a variety of reasons. Such as grain boundary precipitates on time, regardless of their strength than the matrix strength is strong or weak, are all causes of cracks; grain boundary segregation of inclusions on the fracture is also the reason; In addition, even if far less than the yield limit in the cross variable load, can also cause fatigue fracture phenomenon.


Different uses of steel with different technical conditions

Different uses of steel in accordance with the actual use and working conditions for the different response to pipe size tolerance, surface quality, chemical composition, mechanical properties, process performance, and other special properties such as, the different technical conditions.


Development of seamless steel pipe

China's first seamless steel pipe production history, or a solid ingot is made of the capillary tube through the hole, then through the hot-rolled, cold-rolled or cold call is made.Specifications of seamless steel pipe with a diameter * wall thickness in millimeters, said.Hot-rolled and cold rolled seamless steel pipe points (dial) types of seamless steel pipe.Hot-rolled seamless steel pipe generally sub, low, medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological.Cold-rolled (allocated) Subject to sub-general seamless steel pipe, low and medium pressure boiler pipe, high pressure boiler pipe, steel pipe, stainless steel pipe, oil cracking pipe, other steel, but also includes carbon thin-walled steel pipe, alloy steel thin-walled,thin-walled stainless steel, special steel pipe.Hot-rolled seamless pipe diameter is generally greater than 32mm, wall thickness 2.5-75mm, can be cold-rolled seamless steel pipe diameter to 6mm, wall thickness to 0.25mm, outer diameter thin-walled tube can be less than 0.25mm to 5mm thickness, cold than hot-rolled high dimensional accuracy.

The application of seamless steel pipe in various industries

As the pipe bending ability, so in recent years, factories, stadiums and other buildings of the roof frame, beams, columns, adopted steel housing, with the development of steel production in the construction is also more and more use ofsteel structure, daily utensils, furniture, water supply and drainage, gas, heating and ventilation, means of transport and agricultural equipment manufacturing, underground resources such as coal, oil and gas development, defense and space used guns, artillery, rockets, missiles, etc.are inseparable from steel, so the pipe on the development of national economy and people's standard of living are closely related.


The ways to eliminate rupture phenomenon of cold drawn seamless steel tube

High-precision cold drawn seamless steel pipe abroad is generally increased in the metal alloy approach to improve material performance in the cold drawn seamless steel pipe, after all need to stress annealing, to eliminate residual stress of materials, to improve the organization of materials,improve the plastic material, thus preventing the purpose of seamless steel pipe fracture failure occurs.


The standard Index of Precision seamless tube

1) Precision Seamless main varieties: DIN Precision Series high precision seamless bright, dedicated precision seamless hydraulic system, automobile manufacturing special precision seamless tube

2) Main standards: DIN2391, DIN2445, EN10305, DIN1629, DIN1630, ASTM A179


Seamless steel pipe production

Seamless steel pipe production technology :                          seamle